diff --git a/container-with-most-water/hozzijeong.js b/container-with-most-water/hozzijeong.js
new file mode 100644
index 0000000000..dd808b7b9d
--- /dev/null
+++ b/container-with-most-water/hozzijeong.js
@@ -0,0 +1,36 @@
+/**
+ * @param {number[]} height
+ * @return {number}
+ */
+var maxArea = function(height) {
+    // x축이 가장 길면서 y축 역시 가장 높은 즉 높이가 가장 높은 값을 찾으라는 의미.
+    // startIndex값과 그 값에 해당하는 height를 받고
+    // endIndex의 값과 그 값에 해당하는 height를 받는다.
+    // 여기서 가장 큰 점은 startIndex와 endIndex가 멀면 멀수록 좋다
+    // 그리고 그 값을 하나씩 줄여가면서 더 큰 값을 찾아 적용한다
+  
+    let max = 0;
+
+    let startIndex = 0;
+    let endIndex = height.length -1;
+
+    while(startIndex < endIndex){
+        const startHeight = height[startIndex];
+        const endHeight = height[endIndex];
+
+        const xLength = endIndex - startIndex;
+        const minHeight = Math.min(startHeight, endHeight);
+
+        const size = xLength * minHeight;
+
+        max = Math.max(size,max);
+
+        if(startHeight >= endHeight){
+            endIndex -=1;
+        }else{
+            startIndex +=1;
+        }
+    };
+
+    return max
+};
diff --git a/design-add-and-search-words-data-structure/hozzijeong.js b/design-add-and-search-words-data-structure/hozzijeong.js
new file mode 100644
index 0000000000..78223731df
--- /dev/null
+++ b/design-add-and-search-words-data-structure/hozzijeong.js
@@ -0,0 +1,39 @@
+
+var WordDictionary = function() {
+    const dictionary = new Set('');
+
+    this.dictionary = dictionary
+};
+
+/** 
+ * @param {string} word
+ * @return {void}
+ */
+WordDictionary.prototype.addWord = function(word) {
+    this.dictionary.add(word);
+};
+
+/** 
+ * @param {string} word
+ * @return {boolean}
+ */
+WordDictionary.prototype.search = function(word) {
+    if(word.includes('.')){
+        const dictionaryList = [...this.dictionary];
+
+        return dictionaryList.some((dic) =>  {
+            if(dic.length !== word.length) return false;
+            
+            return [...dic].every((char, index) => word[index] === '.' ? true : word[index] === char)
+        })
+    };
+
+    return this.dictionary.has(word)
+};
+
+/** 
+ * Your WordDictionary object will be instantiated and called as such:
+ * var obj = new WordDictionary()
+ * obj.addWord(word)
+ * var param_2 = obj.search(word)
+ */
diff --git a/reverse-linked-list/hozzijeong.js b/reverse-linked-list/hozzijeong.js
new file mode 100644
index 0000000000..fd812b56fc
--- /dev/null
+++ b/reverse-linked-list/hozzijeong.js
@@ -0,0 +1,47 @@
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+/**
+ * @param {ListNode} head
+ * @return {ListNode}
+ */
+var reverseList = function(head) {
+    let prev = null; // 1 | 
+    let current = head; // [null, 2] | []
+    let next = null // 2 | 3
+
+    // prev = null
+    // current = 1
+    // next =2 
+
+    // prev = 1
+    // current = 2
+    // next = 3
+    
+    // prev = 2
+    // current = 3
+    // next = 4
+
+    // prev = 3
+    // current = 4
+    // next = 5
+
+    // prev = 4
+    // current = 5
+    // next = null
+
+    while(current != null){
+        next = current.next;
+        current.next = prev
+        prev = current;
+        current = next;
+    }   
+
+    head = prev
+    return head
+};
+
diff --git a/valid-parentheses/hozzijeong.js b/valid-parentheses/hozzijeong.js
new file mode 100644
index 0000000000..caae0603ab
--- /dev/null
+++ b/valid-parentheses/hozzijeong.js
@@ -0,0 +1,30 @@
+/**
+ * @param {string} s
+ * @return {boolean}
+ */
+var isValid = function(s) {
+    const smallBracket = ['(',')'];
+    const middleBracket = ['{','}'];
+    const largeBracket = ['[',']'];
+
+
+    const leftStack = [];
+
+    for(const char of s) {
+        if(char === smallBracket[0]){
+            leftStack.push(smallBracket[1])
+        }else if (char === middleBracket[0]){
+            leftStack.push(middleBracket[1])
+        }else if(char === largeBracket[0]){
+            leftStack.push(largeBracket[1])
+        }else{
+            const last = leftStack.pop();
+            if(char === smallBracket[1] && last !== char) return false;
+            if(char === middleBracket[1] && last !== char) return false;
+            if(char === largeBracket[1] && last !== char) return false;
+        }
+    }
+
+        
+    return leftStack.length === 0
+};